Jaw of bit-stocks.



v No. 814,320.

PATENTED MAR. 6, 1906 W. A. PEGK. JAWS GP BIT STOCKS. Anmmmmx 11.31) n13.z5.1905.

UNITED STATES PATENT OFFICE.

WILLIAM ALLEN PECK, OF JERSEY CITY, NEW JERSEY.

JAW OF BIT-STOCKS.

Specification of Letters Patent.

Patented March 6, 1906.

Application filed February 25, 1905. Serial No. 247,379.

To all whom it may concern:

Be it known that I, WILLIAM ALLEN PEoK, a citizen of the United States of America, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented new and useful Im rovements in Jaws of Bit- Stocks, of which 1; e following is a specification.

This invention relates to bit-braces and like tools which comprise a chuck for drills, &c., the object of the invention being to provide an improved jaw construction for chucks such as are used in tools of the character above referred to whereby the butt-end of the drill or other tool to be inserted in and held by the jaws may be centered in line with the axis of the chuck and whereby an abutment is provided for the end of the drill or like tool to take the end thrust thereof, a further object being to provide improved means for securing the inner ends of the jaws together in a manner to permit their necessary freedom of movement toward and from one another and to provide an improved spring construction by means of which the free ends of the jaws may be normally held a art.

The drawings accompanying t llis application clearly illustrate this improved construction and certain modificationsof the same, Figure 1 showing in sectional elevation the preferred embodiment of the invention in a two-jawed chuck of a well-known type. Fig. 2 is a similar view showing the'constrnction in a plane at right angles to that shown in Fig. 1. Fig. 3 1s a cross-sectional view on line 3 3, Fi 1. Fig. 4 is a perspectiveview of a. pivotblock located between the inner ends of the jaws and constituting a seat for the inner end of the tool. Fig. 5 is a sectional elevation similar to Fig. 1, showing a modification of the construction in this lastnamed figure. Fi 6 is a sectional elevation similar to Fig. 1, s owing another modification of the construction shown in this lastnamed figure. Fi 7 is a cross-sectional view in the plane 0 line 7 7, Fig. 5. Fig. 8 is a cross-sectional view in the plane of line 8 8, Fig. 6. Fig. 9' is a perspective view of the block-and-pin construction shown in section in Fig. 7. Fig. 10 is a perspective view of the end of one of the jaws shown in Fig. 6, and Fig. 11 is a pers ective view of the springs for the jaws use in the modified constructions shown in Figs. 5 and 6.

Referring to the drawings, a is the head of the chuck, exterior] threaded, as shown, and provided with a s eeve b, screwing onto this threaded end, this sleeve having the usual enlargement c and the tapered contracted opening at, a ainst which the similarly-tapered ends of the jaws e and f bear and against which these jaws are spring pressed, all of which is common in chucks of this character, and the invention does not relate to these general features of construction, but particularly to the specific construction of the inner end of the jaws, as more particularly referred to above. The head a is transversely slotted in the direction of its length to receive the feed-jaws e andf, the inner ends of which are seated, as usual, in the lower end of the slot in the head.

The preferred construction embodying the invention is shown in Figs. 1 to 4, inclusive, and referring now particularly to Fig. 1 it is seen that the cont1guous faces of the jaws and f at and above the ivotal point of the latter are rovided with recesses g, and a block it is coated between the jaws at this point, two opposite sides of which fit substantially in these recesses g. From these opposite sides of the block near the base thereof the pivot-pins extend through the holes in the aws and proect beyond the sides of the jaws, these pins having holes drilled therein to receive the sprin s m, which have a driving fit therein. Near Sic lower ends of the jaws e and f holes 0 are drilled therein in a line extending toward the free end of the jaws outside the chuck, and the springs we enter these holes loosely. Before these springs are thus fitted to the jaws they are formed an a curve, as shown b their dotted position in Fig. 1, whereby w on the free ends thereof are lo cated in the holes 0 the jaws will be under a constant outwardly-exerted springpressure, whereby their beveled outer ends will he yieldingly held a ainst the beveled portion (1 of the sleeve. T is manner of applying the springs to the jaws serves to hold the inner ends of the latter yieldin ly against the block 71, whereby the latter will located relative to the two jaws, and as the inner ends of the jaws are centered by their seats in the head a and their outer ends held in the same relative position by the sleeve the awe and the block it will always be in axial alinement with the head and the sleeve.

always be centrally That end of the block h looking toward the open end of the chuck is rovided with a conical recess J centrally t ereof to receive the butt-end of a drill or other tool, whereby that end may be located on the axis of the chuck, and as the free ends of the jaws are held in their axial alinement by the sleeve the tool will be securely held in such alincment when the jaws close thereon b the screwing up of the sleeve 1) on the hem It will be noted that in this construction the parts may all be assembled without any mechanical operation and in case of the breakage of an part may be dismounted with equalfacihty, the springs serving as the binding or'retaining elements, which hold the parts together.

The modifications shown in Figs. 5 to 8, inclusive, involve the same idea of a centrallylocated block between the base of the jaws to serve as a seat for the inner end of the tool, and their construction in its general princiles is so like that just described as to bring 0th of these modifications within the scope of the invention.

In Fig. 5 the block h is separate from the pivot-pin, (in this figure indicatedby q,) this pin in this figure being shown as driven tightly into the jaw f and havin. a loose fit in the hole in the jaw e, the bloc also fitting loosely on the pin. Each of those faces of the block through which the pin passes is provided with grooves r, extending lengthwise thereof to receive the U-shaped springs 8, (shown in separated relation in Fig. 11,) the free ends of which springs extend beyond the end of the block and bear against the inner faces of the jaws above their pivotal point, thus pressing the free ends of the latter outwardly, these springs, as shown in said Fig. 11. and elsewhere, bein U -shaped, whereby they ma straddle the Iflock h in the manner describe In this construction, as in the referred construction, the end of the block 7? is provided with the conical recess 10, located axially thereof.

In the construction shown in Fig. 6 the block it is shown as being made integral with one of the jaws, this particular construction being shown in perspective in Fig. 10, and while the block has been shown as integral with thejaw it is entirel immaterial which jaw carries t is block. 11 this construction the same grooves r in the side of the block for the reception of the springs s are provid ed,

and to receive the other leg of the springs, which, as stated, are U shape, holes t are bored through the block and extend beyond the end of the latter, and thus the same springs as are used in the construction shown in Fig. 5 may be used in this construction. The pin g in this last-named construction may e loose in the aws or may fit tightly in that jaw on which the block h is located.

Neither of these modified constructions is as desirable as that shown in Fig. 1, although the function of either of them in centering the butt-end of the drill or other tool is precisely like that of the block h. (Shown in Fi 1.

Vhi chever one of the block constructions described herein is used, it will serve as an abutment for the end of a tool inserted in the chuck and take the end thrust of the tool when in use, whether the centering-recess p be formed therein or not.

In further explanation of the practical advantages of arranging the abutment-block it between the inner ends of the chuck-jaws it will be observed that the construction described possesses means for not only holding together the inner ends of the jaws, but also for permitting such a freedom of movement toward and from each other that said jaws will readily ada t themselves to the shanks of tools or toolits, whether of a ta ered or non-ta ered form. At the same time the block it constitutes an abutment which arrests the inner end of the tool of tool-bit in trhe'proper position without permitting the same to dro past the inner ends of the 'aws or assume oblique or non-centered ositlons. These results are rendered possible y reason of the fact that one or both of the chuckjaws are recessed at their inner ends to receive therein the abutment-block. This recessing of one or both aws at the inner ends thereof provides a construction whereby the gripping portions of the jaws contiguous to the abutment-block pro'ect over such block and maintain an axiall y centered relation with reference thereto. A further point of advantage in the construction referred to resides in the fact that the abutment-block and spring-mounting are carried directly by the jaws at their inner ends, so that this part of the tool is removable and replaceable as an entirety entirely independent of the head or shank carrying the same.

I claim- 1. In a chuck, a pair of o posed jaws, an abutment-block carried by t e jaws and extending transversel across the interval between the inner en s thereof, the projection of said abutment being past the gripping portions of the jaws contiguous to the block, whereby such jaw portions overlap the block and maintain an axiall -centered relation thereto, means for yiel ingly pressing the jaws apart and for yieldingly connecting the lnner ends thereof, and means for closing the jaws upon a tool.

2. In a chuck, a air of op osed jaws, a loose abutment-block arranged between the inner ends of the jaws and overlapped b the contiguous portions of the grippingaces,

ivot-pins holdin the jaws and block in oosely-engaged re ation, a spring held in pos14,s20 V 3 sition to the paint of support for the jaws and nested relation, as spring arranged to norblock and arranged to press the jaws apart, lnally support the jaws at both their inner to and means for closing the jaws. and outer ends, and means for closing the 3. in a chuck, a pair of opposed 'ews havjaws. 5' ing recessed inner ends, an abutment-block WILLIAM ALLEN PECK.

arranged between the inner ends of the jaws Witnesses:

A. K. MCDONALD, H. W. BRIGHAM.

and Within the recesses thereof, pin members for holding the jaws and block in loosely-eon- 

